User`s guide

3-48

Conﬁguring

Scenario 2

Station C sends out a broadcast for station B. The frame from

station C will have a Null RIF (2 bytes). Since the ATX’s P3 is

conﬁgured for SR, the ATX will add Ring 2, Bridge 1 to the frame

and send it out P2. The conversation between station B and C will

be source routed and the ATX will behave like a SR bridge. The

conversation between station B and C will be source routed and

the ATX will behave like a SR bridge.

Example #3: Unsupported Conﬁguration

Problem

If Station A sends out an All Routes Explorer packet destined for

Station B it will initially be learned by both ATXs on their Token

Ring interfaces. After the ATX performs the Strip RIF portion it will

forward the transparent frame to FDDI. This results in two

transparent packets on the FDDI with the same Source MAC

address (Station A). This causes each ATX to relearn Station A on

its FDDI interface. The response from Station B to Station A will be

seen by each ATX’s FDDI interface and not be forwarded to the

Token Ring because Station A was last learned on their FDDI

interface.